- since the default value for Position is Nowhere now.
Also, remove reduntant header and change stream to ostream in to_strings

The concept has been reworked a bit.

It is called "flex" atm but it is subject to change.

Add the tagset-symbol-getter operator (GetSymbols), bump required Corpus2 version to 1.0.2 since new features are needed.

For example, it can now be used in Conditional, which is done as well.

Introducing base abstract class FunctionalOperator and template Operator<T> for a functional operator returning given type of Value. Assortment of copy methods and apply methods.

Intended as a base class for library-user-level operators and rules. Allows manipulation of Variables via get, set. Intoduces cloning support.

Doesn't hurt and can help.